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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2076a4d684b081a9c74ed1bccb1b6779312ea69f9ab83e4561b746db629c3ae7' 
  AND token = 'rnli/kwcviiel6Cxyns/agMEoaUjGW2euMMjHwIWCpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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