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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3272fd5ba824838546a11f7d71845b00e87e3d2dcd536146700771ef9276f8d4' 
  AND token = 'ftjmBonm9JY9sZO/zu3GThTut75/Oojtbg7TxTdRnug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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