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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f6e0a9ebb0eac7c0ce24b5747b9ce028fd470ad0274af8d9cc60ef45a68b1e' 
  AND token = 'a/IhVJui2jZibP0XbgQOYZa1572lSVyljKNv9IIBsMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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