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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b36b1b8398f5e495551f37cd4d7484688074f1f1b29d23f9c83a70af5d525a' 
  AND token = '24JvPTCxglO4ekAEDKUGlkbGYqNNofF4eiBWAuqRGqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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