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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63fcd8631d0dd561205cfebdd3b5cdbb2c80ecfda25d713e693aa8c07deb28e1' 
  AND token = 'u0s4dQK0eEoUv+ps9SqSAr/KYlg9A3gCOHNXhcSyNw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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