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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43a426e630d0e299f90e5eb11a136f7d0c78a2c834ee7815d71437cbfb13860f' 
  AND token = 'PpRH9Htde1dcI9L9vX9uxO/ZB3FbMwxxQCIAkr3c7OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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