SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f46c8ad5309b58c136df57c1267b536b3e2352f67e16ba47356b71f9ba2e3f' 
  AND token = 'tmKqBMYaWNHrhMW4lneEwhoOTPh4xazq4vqOghViuco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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