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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a557447ea630d3eaddbd4c0dea63b60d93a5ffe70caf031a73888890ffbc437b' 
  AND token = 'Q9WZb4apoJTBTrRc9bIFc8QNE1ZaHB3CG/PQN5tYgY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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