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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1da53a3e9b5c8273db1652a7729026e0cfb29c4ba8d2e2642e9fdfed4c28fe7' 
  AND token = 'yfh5ZqpoDKyFjnn+7N06JAlRU4sftN3U3M3iuF/5Pvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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