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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '894feb40afca4c631dfb3cde86476a9a4f3ca40423141c89f94560431879bbe8' 
  AND token = '36W+FpvfLw0NAtg80fjvFVWbSceEwLZOp2S3v6ddGRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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