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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '218a9e25f9673098be038574071cb39a42191c3ed4470f6416c1b9113191ad79' 
  AND token = 'SBlT7KdIZTApvgeewsHgnYPUt2PY9ABtj5FMLPGeg1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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