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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90fc7604b8faac67f023ffc16acf7f80a8c945ef0df3054326adfde4e3fa4d77' 
  AND token = '2kJHqH8ATPJEW5hQiHvcH7+LbU7AeHHyxVbp25W9ePw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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