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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4f826b43242bbae98ac8d3ed9021957edc18f431bbce6ed15d53342a8e9b269' 
  AND token = 'XEf8EioqoW3vMGKzmIgG3qH6VNczbXlWof/Q/SbjSpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00146

JSON explain

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