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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '023ad91665b0ecd6317f1890b1e4426b142edeb0229fef7e926553031f272e25' 
  AND token = 'sRv/56+cV+hOC1sKf1ZbxmVSrhpTXrHc2akT2fIUn5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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