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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4db113d74e66e8390353ee700af818a5c6b5e1db347ec6dd2334cb8468ade13' 
  AND token = 'I7fAYdqKVC2Lf4M/stuu+47aLTQJjaiOdbrFOsVL6D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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