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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5d4a42ca569192b2039c66a3ccc3edc6dc3c2d1e7743cf2d6bdc6cf2386a6b4' 
  AND token = 'oJKKRzY4y1UbIy+DaujOjL0yU02OTTuJ+FEJXnjpyAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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