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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6828f62af5cf61225c26e7afa798745a797ffd849309d8623e044f9e7b500ea2' 
  AND token = 'J722YBqqKnTDrdUYpiNr5lt4ts8JBO4o3SJSk0FMMo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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