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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a54107c7560b2098af79b4b0516318d6b4fd6f2ec8c6ae8fc643cccc94b9f4c' 
  AND token = 'xfqhCLPeIuSaUIfyuz/T9kTIo9Zoz+37Du8YSu3wZb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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