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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8d7c1e37b40675ac8ae9c0a4b7c99a2d3d825325b1d4fe556f9a69771a177d4' 
  AND token = '6QXhTZHZ6eZ7+uAbDA4qer5zcN1eif4mXtzUk8WJpY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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