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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40d0133218eccde06e56146dae31246050880abf9ebd44c4339cb4ab6ed13798' 
  AND token = '409Ar6IX/Vmo/RZFUaKe8lluJJQfu+WOrHJgJM9RpKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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