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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27e63e2b63683a13841865f2a84c8ced1acefce067beaea90ee28c97736b6c0c' 
  AND token = '0VJM+ES07kOQ8t+7BLJTPXEuRov3B8JSybSRs2NuiP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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