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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf1a262067bf337f73b2605bcd483228c66e8119bd743451e98975b17765a6db' 
  AND token = 'Jw91XFku1ZtYG3tu9R4e1c72UAMGJ60KZTq7KB2438U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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