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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dece56520071413480e6b340e7f86df0e108c884862fc0d8a901c0ba75af3dd' 
  AND token = 'W70Li5SpUA7KdKF+Lp00yfvpCK9MhIyRZ+j3IC4f9kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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