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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '839cb47e38957cbd3147c66e6ca1b7a9e689a60d5e2f3ab9213db021e8a9df6f' 
  AND token = '43pwWrfKcSx4aYtywILk+2TD7p+Zc+uQIwyeozhUrlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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