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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0009abaec03b42e64ef3e7dbe24f80485243ee6ef4fadaaefea72eefc19ae1f' 
  AND token = 'o0bUKNQhzVDa7OJik8eTkvEYY5ZvsEDU5Xr/imHlzog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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