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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38af3095b540ef6f3b972ccdfeddea2e299776e39a9dfbfb16def7d2e374c35a' 
  AND token = 'X4xSCuYqgcYGxEH1h+DV8rIpkt0GAoeeu82jOzKoAjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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