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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40e343961f68b1394265a27b906d155e9545452fa6c33629714393917007eb0' 
  AND token = 'PZ1/GBIlGaDbbOj2wOxjdSwVRljMe3HBQ/1uyYaSXqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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