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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f82669c9f35a9ae1cebafae6cf29ebfc0145ecbacc9ff81937b5b6f6a999aaa' 
  AND token = '1fdhOJoiTpyAP9wXyD/MGm+IMLHH/K9u/vg/35TFd98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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