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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ded93ba6c991806c7713004507575dcb5a30f43d80280c0c40d868cf75018570' 
  AND token = '5hYL5yHgABRc4TuwaqaK9An3b+wkgHVO78kmq6knDgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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