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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e01d5a58089b40eb85e457c27add4781d70360a2a608fcb4bd2a7153cea2d6' 
  AND token = '/8Dey+x2aM59QXovY31XPzqkWC/9dmu/9V+YDsMi3c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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