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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93be9c9ac5b4346b04845ff7223c3bad9e6b02838db1882f129ba5ebc4d56beb' 
  AND token = 'Nk/3wHaPVPs03nvCWwRulMgBbpD/cUTS9KPnc7yrx+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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