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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8c0bc2dec0a1b9cfbd1300c37ae1cbaeb35b3af3ea84dc423ae2a8c1db0b15b' 
  AND token = 'FlySREoB6bKY3BXC4x4fzyDsY76Ag+bFxPx9ypiZj6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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