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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e2beb35b27359cab3c632971eb8f83702da3814752b2483db2989570a69d9ad' 
  AND token = 'ZIhLt39piETgbEEmPBdyODbDjCj89D325m/xuXqzTSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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