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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '948e40d50d5d1bfa6290123ba5a7ee29ad38885eb8d612dd1ca9201aacc16b75' 
  AND token = '5RHe3u2VebqrEjMqzQ9cdj34AK+8jDfQ32ro5FXLFHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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