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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f2f4c4499eed7ff4c0a6f7c3d7464b8b7760f1eae8712a81b890853dfb9c7b1' 
  AND token = 'zjpNAYaaaYtkxTzlwonxb4yn063f60sENEI+vZJ6ysc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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