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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b6a00537a37c65b2c94db485487d7f834325e024f1916a9dcf4f9b5ba85c9a0' 
  AND token = 'N97Za/2Lx9vBZT2VVjtHucp9IF5zrmZZn8L7lJkie/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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