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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc6d58d28487f6dabf5a16072674e8654ae5196e9ab01fc758941c2d8333d1ab' 
  AND token = 'DEjbn/XGId/l/T17ZHcp+5CsJjsFlf8CwPZgiefd7c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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