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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dfe98d8c66c4893a0bd46b174f1a784ad48a0a29b97270336dd3e93b2b926ad' 
  AND token = 'yR09MePHYowtBrNGAVZnirLEkQTIEJiXLWmUC+6FU6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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