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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a50b113c5f169a813a8f7de7e2569b9f775af90eaaf7936d57580eadf58ce03' 
  AND token = '2qDPGKJ+vsiK7iKHlM+lAKb0OTL/VevlorWbdIUP8hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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