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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8414991f79ecca8d15494fc419acebf710545c3eb0f1bb752691ea1255fe5e35' 
  AND token = 'h6hwfs0A2yjQrcVVOTub0bM5WYGwkNOgirMs5bkzNuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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