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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809d3d1e09a7818adfe6f9c01f8f115f7ee32f2f32c6daa4252bc5d621b3d667' 
  AND token = 'QTSNo45R13u7OH88QK+ZzDfZxKRmX9JxZausZ/LTYa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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