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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae8456a5037abb17983cd26106b2340679982edb4a703e5654921acf606878b0' 
  AND token = 'VE8YZ3pSlVFn42PlwWMoA2+vtJhM6o6S2X8ctGURE0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}