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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e8bc6a258994ccb629e1d5b275ca2d0af40f05019ac7e39598c9648c9204a85' 
  AND token = 'wda8RvOojnoA5TUDhbehDl5k4tTSF/jDrDXzuAZIqas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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