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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ecbf55a4bae19d59b08fa485373ce11efa6d67a5c54f9c6d3e7ad6342b2ad2a' 
  AND token = '52UXDs3Q/6CcIWyxkU1ZTcYHo5pTxgEv0WxPq/aRDN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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