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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35fc34ef053932586ee83aa9b5ea62e209e35f798f0fefbd31a08e0cd3e26790' 
  AND token = '++6R0kNMJPZVySM8DGC7Igz/LAOxqqu9GZjIbXhjRsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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