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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '741dab6882797ad6930a74f03fcc56e5df48856a13ad7c2d364feb1e4a59eda8' 
  AND token = '9AsnaSqsxiyqEvUQ33T5vNZlH0hJ5jXz0QFJNcb212U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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