SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2fc4469e3e6944783f930fec1c656ba42f5a2178f8f4aa463984d25d3387518' 
  AND token = 'mlYPWhX+vldurhLdCnbDkVHBqE+202P4nhEWOKHvY1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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