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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a32949f6f337530e7339b508ad0ae52ee996ca0aa54585cc20e1aa14a8e69e4' 
  AND token = 'FdR3j/w4nns5jzgB3K7Cmle7JPxZmV7DwunwMQQe6XY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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