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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '862025cb66bd49bad96777615271c0c4fb6171ed16386c54c1ad7baa344db336' 
  AND token = 'fRAx9EedlLNuKX0uoPhhlNLn0JYiAwPQjAPYw8qrJHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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