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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '972ecdb5da7b0de242bc45817f3ca5ebfcbf4af2ad01862dbb86bbd8601372ed' 
  AND token = 'gMfv1pIw6BLuQx/3F2vk1S8neHTcoN67/845DkQTWFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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