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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3668f4481e29b7ed4efc64f34b4a919081fdb7c5df2d6aff4263beeda6e04bd' 
  AND token = '5GbLsT05Q8r/zD9UiY7Op7L5vcvg9zv3e/TrSxcYvj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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