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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b87bd6f7b94e14670e6ef7b82db5af503a2fb72933defb456bde830a8d3d7684' 
  AND token = '2KyTrA5Y9JsSOLb7TKOM3D9Lf7yWxiav5JpukwrTVxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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