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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c79b507c578910ed6c0b8597252ce035cb657a81196c889b7eb8ba64705d33' 
  AND token = '+AhflPSqPuuRpD7U3fUAqnPuf4HHfdkUoMaD+1ptZ4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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