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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037208566d62ecec4ca831cf629232b168c638afee524e89b67954ce839d8604' 
  AND token = '25QTrZRX1cTd1l20Jg2izEGX6yJvTXAxkkDibg/7vi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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