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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e22e0ca0bb219ceecea654759852957fbabc7b277acb1bd07bc1532644fcd3da' 
  AND token = '/hd4P+nhHXdohyebrKdLtesO93a9ljIqtUWOzwKmn5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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