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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8df75b58275365450966c21e87ca88c759d8cc87ff31e140df355e3c86d1f5' 
  AND token = 'YuovLbsa4OLDw2Ct6+J6qAVQgCVNgH47e4WJTEEWzI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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