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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf0cbe65cf92156c13501f394d66574f101e63ca032723eda2366b017a76bd39' 
  AND token = 'U0JjBC3vrX5y+5erihfufH8jPq4To7O/j2riEgdrtfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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