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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0bc0bfae80a1dc8a30c935eba9a2fee75a2446c66a10f67ebaf6b91bb24b9c1' 
  AND token = 'V3WyAeln6Ecu+0xG6ICdLlKJCbdwHvbQLQpVl+mIuaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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