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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a5a309da46ec7997b685a7984ffee73dbb07487631effcfab732ecb0397d6a' 
  AND token = '2sABLj2TbA9qx1nxBVpQz4+ZezGFhsbHhSan8bvrdu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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