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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f1cf0eca416ddd58ca3c3da8e7c62ad8170560fb8a86b02c4e63164d179e25' 
  AND token = 'vJlHQq22ypSeuQPAEyROb9PtZ4nHjpkzHbgOUYk0CTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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