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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02fea3b704dad636f2c21b3b1ddcf3221d6e2abd880d111acb9a38f2be5dcffe' 
  AND token = 'y4I3AsTmY6DBmnAsArWREKkUiIsZ3w2axgxdKArVzOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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