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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '710b198cad45c5d724058ec87e144c74cf557e8a177a107a0614a621f9ca9657' 
  AND token = 'CK24WOfaQ5xqtQIe5lIjm8RxWPi++dGCFjmGFG2X4sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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