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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60868b2357d4b176c35e76a5128495d1635986c49ab0c11d39d6ad6a74f3dc00' 
  AND token = 'xm2arRlVjRpT+d2dUvO9JfybUtis415berbudklROjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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