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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac787453bab57147b56dce7354477d355abd43bd5e4c77792d42ecca77e4f22' 
  AND token = 'RssF8l4uI+7kyh1Gxbqfbx2TkCa8ppb2JB02y65GOzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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