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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c33c1217fc82c05adb1240b84cad9af20dcf80ea15731a57daabe763371042' 
  AND token = '0h4UHucYj4ruxgh8wu69dXt2J7HRrlp0uvxTtbKu5YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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