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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8a108bfbaf9c4ca992c5f03c6966592f3c6100ad0aafad3421e1318b186a7fc' 
  AND token = 'J2l3zRTivFU2NhudXk7sqzmVEFkhq9eEujaTqpCkYO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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