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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c051a7087877b48224bc7ad953c5c13ae386a40cdad8416f3a6fad639fcd50' 
  AND token = 'dczZw0jMpHvzbfQTQHtyntiI3Anj8uw9FVkLapUhjdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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