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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85abd74e6382c54bbeaf9d847fce00b755b0d0cf61c4cce8caea42a9db11e5ce' 
  AND token = 'rSkMib/9me1W7GjuslwFnrjwbNx0WqLG7mNYzeCj4l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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