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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01a668b9c0ce04dde62ca2ab32011604b8233a2af252f4d54f9a86ebaf7d110b' 
  AND token = 'Q1TNYcmfhX72SqoXaHGNg2Mk90FnjJMjkiFjSSosyX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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