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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c53a30165968793aae4045e9396b5d3aa7d8e5c1446c4a032841658f5f9ee04a' 
  AND token = 'bZTFzAsl+p/TC+vkX81FWadDiAG6aEjabeXb/vpmo0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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