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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef0db1cc51ff64296afe0669c2f7acfc7f6a036c8bfea5fd6bcefe902a44816c' 
  AND token = 'cEcQpBg5RARJk9jcZmxST8CrnJ1prUx0v1a77ioAYBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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