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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c26a7a31dbb61928ae3181917108bbcbfe92fe605e5d99404da4584b701d17d' 
  AND token = 'Y31vXSOxWel+wsi8Wzpn5Rzk5PspdhTi8VASeHqC5hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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