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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1117223456d973e8cab371a2a43f03b94757217ce2536489a0b6d52d8e2795cc' 
  AND token = 'H+C9YfH0x+7dC7nOAgWXkdjh4e7JqUHszDGxox4tsb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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