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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e4a03f8759b9a515a95720578f59aff8eb33ccdd4cf891883e584fd94ab21c' 
  AND token = 'b4bHQg/pdaOvPmRF3Gz4QnRkmbcMI1EFm4kxeCDOokA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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