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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d9f3ce155b407b89030884f04f6be17373c8ef7d12b4a8186db83e1fb42fde' 
  AND token = '/5RfjGJUJ6rv5m+M4c630N/kgD970RZ+ch6YFQshSx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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